*
* Check the command line options given by \a argc and argv, set default values
* for user name and rsa key file, read further option from the config file.
* Finally, establish a connection to para_server.
*
*
* Check the command line options given by \a argc and argv, set default values
* for user name and rsa key file, read further option from the config file.
* Finally, establish a connection to para_server.
*